96 TRANSACTIONS OF THE [MAR. 2,. 
Wagner deduces the length of the tropical year=365 days, 5 hours,. 
48 minutes, 46 seconds. Dr. Dreyer contributes some notes on M. 
Wagner’s paper, as an appendix thereto. 
Recent Literature. Under this head the Editors have furnished reviews 
of monographs and papers on various subjects. The papers re- 
viewed are indexed chronologically as follows: 
1.,8139. 
Variable Stars of Short Period. By Edward C. Pickering (Proc. Amer. 
Acad., Vol. XVI.). 
Bibliographie générale de l’Astronomie. Par J. C. Houzeau et A. Lan- 
caster. 
Observations on Jupiter, by L. Trouvelot (Proc. Amer. Acad., Vol. XVI.). 
Spectrum of Lalande 13412 (EK. C. Pickering, Science, No. 41). 
A Lost Comet (KE. E. Barnard, Science, No. 47). 
I., 183. 
Reports on the Total Solar Eclipses of July 29,1878, and January 11, 
1880. Issued by the U. S. Naval Observatory. 
Large Telescopes. By Edward C. Pickering (Proc. Amer, Acad., 
Vol. XVI.). 
Observations of Double Stars made at the U.S. Naval Observatory by 
Asaph Hall (Wash. Obs., 1877, App. VI.). 
Contributions from the Washburn Observatory of the University of 
Wisconsin, Number 1. 
Note on Photographs of the Spectrum of the Comet of June, 1881. By 
Prof. H. Draper (Amer. Journal, August, 1881). 
I., 196. 
Visite a divers Observatoires. d’Europe: Notes de voyage par M. J.. 
Perrotin, Directeur de l’Observatoire de Nice. 
Recherches sur la Verticale. Par M. Antoine d’Abbadie (Annales de la 
Société Scientifique de Bruxelles, 1881). 
Quelques Résultats déduits de la Statistique Solaire. Par R. Wolf. 
Premier Article (Mem. della Soc. degli Spettr. Ital., 1881). 
Ueber den Doppelstern = 60 = 7 Cassiopeje. Von Ludwig Struve (Mé- 
langes mathém. et astron., T. V.). 
Note sur l’analyse de lalumiére de la Cométe de(b) 1881. Par Ch. Fievez. 
(Bulletin de l’Acad. R. de Belgique, 3me série, T. I.). 
T., RG. 
Celestial Objects for Common Telescopes. By the Rev. T. W. Webb. 
Fourth edition, revised and greatly enlarged. 
Annual Report of the Director of the Dearborn Observatory, Chicago. 
South African Philosophical Society; Dr. Gill’s Address, 29th July, 
1881. An account of the work in hand at the Cape Observatory. 
Catalogue of 12,441 Stars for the epoch 1880, from observations made 
at the Royal Observatory, Cape of Good Hope, during the years. 
1871 to 1879. By Edward James Stone, M.A., F.R.S., etc. 
